Example usage for java.util Iterator hasNext

Introduction

In this page you can find the example usage for java.util Iterator hasNext.

Prototype

boolean hasNext();

Source Link

Document

Returns true if the iteration has more elements.

Usage

From source file:MainClass.java

protected static void print(String label, Collection c) {

    System.out.println("--------------" + label + "--------------");

    Iterator it = c.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }//w  w w . jav a  2s .com
}

From source file:Main.java

public static boolean canWriteFormat(String formatName) {
    Iterator iter = ImageIO.getImageWritersByFormatName(formatName);
    return iter.hasNext();
}

From source file:Main.java

public static boolean canReadFormat(String formatName) {
    Iterator iter = ImageIO.getImageReadersByFormatName(formatName);
    return iter.hasNext();
}

From source file:Main.java

public static Object firstOrElse(Collection l, Object alt) {
    Iterator i = l.iterator();
    if (i.hasNext())
        return i.next();
    return alt;//from   w  w  w .  j a  v  a 2s  . co m
}

From source file:Main.java

public static void printMap(Map<String, String> map) {
    Set<Map.Entry<String, String>> s = map.entrySet();
    Iterator<Map.Entry<String, String>> it = s.iterator();
    while (it.hasNext()) {
        Map.Entry<String, String> entry = (Map.Entry<String, String>) it.next();
        String key = (String) entry.getKey();
        String value = (String) entry.getValue();
        System.out.println(key + " => " + value);
    }//from   w  ww. j ava  2 s.  c o m
}

From source file:Main.java

private static <T> void display(final Iterator<T> iterator) {
    while (iterator.hasNext()) {
        final T item;
        item = iterator.next();/*from   w  ww .j a va2s.c  o  m*/
        System.out.println(item);
    }
}

From source file:Main.java

private static String getFormatName(Object o) {
    try {/* w w w.ja v  a 2s  .  c  o  m*/
        ImageInputStream iis = ImageIO.createImageInputStream(o);
        Iterator iter = ImageIO.getImageReaders(iis);
        if (!iter.hasNext()) {
            return null;
        }
        ImageReader reader = (ImageReader) iter.next();
        iis.close();

        return reader.getFormatName();
    } catch (IOException e) {
    }
    return null;
}

From source file:Main.java

public static void iterableToList(Iterable iterable, List list) {
    Iterator it = iterable.iterator();
    while (it.hasNext()) {
        list.add(it.next());//from   w  w w.  j av  a2 s  . com
    }
}

From source file:Main.java

/**
 * @throws IllegalArgumentException if an add operation "soft fails" (does not modify the collection)
 * @see Collection#addAll(Collection)//  www .j  av  a2 s. co m
 */
public static <E> void addAllForce(Collection<E> collection, Iterator<? extends E> add) {
    while (add.hasNext()) {
        E next = add.next();
        Preconditions.checkArgument(collection.add(next), "collection did not accept next element %s: %s", next,
                collection);
    }
}

From source file:Main.java

License:asdf

public static <K, V> Object getKey(Map<K, V> in, V value) {
    Set<K> key = in.keySet();
    Iterator<K> keyIterator = key.iterator();
    while (keyIterator.hasNext()) {
        K valueObject = (K) keyIterator.next();
        if (in.get(valueObject).equals(value)) {
            return valueObject;
        }//w w  w.  j ava  2 s  .c  o  m
    }
    return null;
}